<!DOCTYPE html>
<html>
<head>
    <title>HTML爱心网页 - 樱花+爱心</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        html, body {
            height: 100%;
            padding: 0;
            margin: 0;
            background: #000;
            overflow: hidden;
        }

        .aa {
            position: fixed;
            left: 50%;
            bottom: 10px;
            color: #ccc;
            transform: translateX(-50%);
            font-family: Arial, sans-serif;
            font-size: 14px;
            z-index: 1000;
        }

        .container {
            width: 100%;
            height: 100%;
        }

        canvas {
            z-index: 99;
            position: absolute;
            width: 100%;
            height: 100%;
        }

        .img {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 100;
            max-width: 300px;
            max-height: 300px;
            opacity: 0.8;
        }

        #cherry-canvas {
            z-index: 50;
        }

        #pinkboard {
            z-index: 99;
        }
    </style>
</head>
<body>
<!-- 樱花容器 -->
<div id="jsi-cherry-container" class="container">
    <!-- 背景音乐 -->
    <audio autoplay loop>
        <source src="renxi.mp3" type="audio/mp3" />
    </audio>

    <!-- 樱花画布 -->
    <canvas id="cherry-canvas"></canvas>

    <!-- 爱心粒子画布 -->
    <canvas id="pinkboard" class="container"></canvas>
</div>

<div class="aa">❤️ 浪漫爱心网页 ❤️</div>

<script>
    /* 爱心粒子效果 */
    var settings = {
        particles: {
            length: 500,
            duration: 2,
            velocity: 100,
            effect: -0.75,
            size: 30,
        },
    };

    (function () {
        var b = 0;
        var c = ["ms", "moz", "webkit", "o"];
        for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
            window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
            window.cancelAnimationFrame = window[c[a] + "CancelAnimationFrame"] || window[c[a] + "CancelRequestAnimationFrame"];
        }
        if (!window.requestAnimationFrame) {
            window.requestAnimationFrame = function (h, e) {
                var d = new Date().getTime();
                var f = Math.max(0, 16 - (d - b));
                var g = window.setTimeout(function () {
                    h(d + f);
                }, f);
                b = d + f;
                return g;
            };
        }
        if (!window.cancelAnimationFrame) {
            window.cancelAnimationFrame = function (d) {
                clearTimeout(d);
            };
        }
    })();

    var Point = (function () {
        function Point(x, y) {
            this.x = typeof x !== "undefined" ? x : 0;
            this.y = typeof y !== "undefined" ? y : 0;
        }
        Point.prototype.clone = function () {
            return new Point(this.x, this.y);
        };
        Point.prototype.length = function (length) {
            if (typeof length == "undefined")
                return Math.sqrt(this.x * this.x + this.y * this.y);
            this.normalize();
            this.x *= length;
            this.y *= length;
            return this;
        };
        Point.prototype.normalize = function () {
            var length = this.length();
            this.x /= length;
            this.y /= length;
            return this;
        };
        return Point;
    })();

    var Particle = (function () {
        function Particle() {
            this.position = new Point();
            this.velocity = new Point();
            this.acceleration = new Point();
            this.age = 0;
        }
        Particle.prototype.initialize = function (x, y, dx, dy) {
            this.position.x = x;
            this.position.y = y;
            this.velocity.x = dx;
            this.velocity.y = dy;
            this.acceleration.x = dx * settings.particles.effect;
            this.acceleration.y = dy * settings.particles.effect;
            this.age = 0;
        };
        Particle.prototype.update = function (deltaTime) {
            this.position.x += this.velocity.x * deltaTime;
            this.position.y += this.velocity.y * deltaTime;
            this.velocity.x += this.acceleration.x * deltaTime;
            this.velocity.y += this.acceleration.y * deltaTime;
            this.age += deltaTime;
        };
        Particle.prototype.draw = function (context, image) {
            function ease(t) {
                return --t * t * t + 1;
            }
            var size = image.width * ease(this.age / settings.particles.duration);
            context.globalAlpha = 1 - this.age / settings.particles.duration;
            context.drawImage(
                image,
                this.position.x - size / 2,
                this.position.y - size / 2,
                size,
                size
            );
        };
        return Particle;
    })();

    var ParticlePool = (function () {
        var particles,
            firstActive = 0,
            firstFree = 0,
            duration = settings.particles.duration;

        function ParticlePool(length) {
            particles = new Array(length);
            for (var i = 0; i < particles.length; i++)
                particles[i] = new Particle();
        }
        ParticlePool.prototype.add = function (x, y, dx, dy) {
            particles[firstFree].initialize(x, y, dx, dy);
            firstFree++;
            if (firstFree == particles.length) firstFree = 0;
            if (firstActive == firstFree) firstActive++;
            if (firstActive == particles.length) firstActive = 0;
        };
        ParticlePool.prototype.update = function (deltaTime) {
            var i;
            if (firstActive < firstFree) {
                for (i = firstActive; i < firstFree; i++)
                    particles[i].update(deltaTime);
            }
            if (firstFree < firstActive) {
                for (i = firstActive; i < particles.length; i++)
                    particles[i].update(deltaTime);
                for (i = 0; i < firstFree; i++) particles[i].update(deltaTime);
            }
            while (
                particles[firstActive].age >= duration &&
                firstActive != firstFree
                ) {
                firstActive++;
                if (firstActive == particles.length) firstActive = 0;
            }
        };
        ParticlePool.prototype.draw = function (context, image) {
            if (firstActive < firstFree) {
                for (i = firstActive; i < firstFree; i++)
                    particles[i].draw(context, image);
            }
            if (firstFree < firstActive) {
                for (i = firstActive; i < particles.length; i++)
                    particles[i].draw(context, image);
                for (i = 0; i < firstFree; i++) particles[i].draw(context, image);
            }
        };
        return ParticlePool;
    })();

    (function (canvas) {
        var context = canvas.getContext("2d"),
            particles = new ParticlePool(settings.particles.length),
            particleRate = settings.particles.length / settings.particles.duration,
            time;

        function pointOnHeart(t) {
            return new Point(
                160 * Math.pow(Math.sin(t), 3),
                130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
            );
        }

        var image = (function () {
            var canvas = document.createElement("canvas"),
                context = canvas.getContext("2d");
            canvas.width = settings.particles.size;
            canvas.height = settings.particles.size;

            function to(t) {
                var point = pointOnHeart(t);
                point.x = settings.particles.size / 2 + (point.x * settings.particles.size) / 350;
                point.y = settings.particles.size / 2 - (point.y * settings.particles.size) / 350;
                return point;
            }

            context.beginPath();
            var t = -Math.PI;
            var point = to(t);
            context.moveTo(point.x, point.y);
            while (t < Math.PI) {
                t += 0.01;
                point = to(t);
                context.lineTo(point.x, point.y);
            }
            context.closePath();
            context.fillStyle = "#ea80b0";
            context.fill();
            var image = new Image();
            image.src = canvas.toDataURL();
            return image;
        })();

        function render() {
            requestAnimationFrame(render);
            var newTime = new Date().getTime() / 1000,
                deltaTime = newTime - (time || newTime);
            time = newTime;
            context.clearRect(0, 0, canvas.width, canvas.height);
            var amount = particleRate * deltaTime;
            for (var i = 0; i < amount; i++) {
                var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
                var dir = pos.clone().length(settings.particles.velocity);
                particles.add(
                    canvas.width / 2 + pos.x,
                    canvas.height / 2 - pos.y,
                    dir.x,
                    -dir.y
                );
            }
            particles.update(deltaTime);
            particles.draw(context, image);
        }

        function onResize() {
            canvas.width = canvas.clientWidth;
            canvas.height = canvas.clientHeight;
        }

        window.onresize = onResize;
        setTimeout(function () {
            onResize();
            render();
        }, 10);
    })(document.getElementById("pinkboard"));

    /* 樱花飘落效果 */
    var RENDERER = {
        INIT_CHERRY_BLOSSOM_COUNT: 30,
        MAX_ADDING_INTERVAL: 10,

        init: function () {
            this.setParameters();
            this.createCherries();
            this.render();
        },

        setParameters: function () {
            this.container = document.getElementById("jsi-cherry-container");
            this.canvas = document.getElementById("cherry-canvas");
            this.context = this.canvas.getContext("2d");
            this.width = window.innerWidth;
            this.height = window.innerHeight;
            this.canvas.width = this.width;
            this.canvas.height = this.height;
            this.cherries = [];
        },

        createCherries: function () {
            for (var i = 0; i < this.INIT_CHERRY_BLOSSOM_COUNT; i++) {
                this.cherries.push(new Cherry(this));
            }
        },

        render: function () {
            requestAnimationFrame(this.render.bind(this));
            this.context.clearRect(0, 0, this.width, this.height);

            for (var i = this.cherries.length - 1; i >= 0; i--) {
                if (!this.cherries[i].update()) {
                    this.cherries.splice(i, 1);
                } else {
                    this.cherries[i].draw(this.context);
                }
            }

            if (Math.random() < 0.1 && this.cherries.length < 50) {
                this.cherries.push(new Cherry(this));
            }
        }
    };

    var Cherry = function (renderer) {
        this.renderer = renderer;
        this.init();
    };

    Cherry.prototype = {
        init: function () {
            this.x = Math.random() * this.renderer.width;
            this.y = -50;
            this.vx = (Math.random() - 0.5) * 2;
            this.vy = Math.random() * 2 + 1;
            this.rotation = Math.random() * Math.PI * 2;
            this.rotationSpeed = (Math.random() - 0.5) * 0.1;
            this.size = Math.random() * 15 + 10;
            this.opacity = Math.random() * 0.5 + 0.5;
        },

        update: function () {
            this.x += this.vx;
            this.y += this.vy;
            this.rotation += this.rotationSpeed;

            if (this.y > this.renderer.height + 50 || this.x < -50 || this.x > this.renderer.width + 50) {
                return false;
            }
            return true;
        },

        draw: function (context) {
            context.save();
            context.globalAlpha = this.opacity;
            context.translate(this.x, this.y);
            context.rotate(this.rotation);

            // 绘制樱花花瓣
            context.fillStyle = "#ffb7d1";
            context.beginPath();
            for (var i = 0; i < 5; i++) {
                var angle = (i * Math.PI * 2) / 5;
                var x = Math.cos(angle) * this.size;
                var y = Math.sin(angle) * this.size;
                if (i === 0) {
                    context.moveTo(x, y);
                } else {
                    context.lineTo(x, y);
                }
            }
            context.closePath();
            context.fill();

            // 绘制花心
            context.fillStyle = "#ff69b4";
            context.beginPath();
            context.arc(0, 0, this.size * 0.3, 0, Math.PI * 2);
            context.fill();

            context.restore();
        }
    };

    // 窗口大小改变时重新设置画布
    window.addEventListener('resize', function() {
        RENDERER.setParameters();
    });

    // 启动樱花效果
    window.addEventListener('load', function() {
        RENDERER.init();
    });
</script>
</body>
</html>